AD/BELL 412/32 - Main Driveshaft and Tail Rotor Drive Over-Temperature Indicators

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority Schedule of Airworthiness Directives, was enacted by the Commonwealth of Australia to ensure the safe operation of civil aircraft within Australian airspace. The legislation provides a framework for issuing airworthiness directives that address safety concerns and compliance with international standards. This particular directive, AD/BELL 412/32, applies to all Bell Helicopter Textron 412 Series Helicopters with specific serial numbers, mandating actions as outlined in Bell Helicopter Alert Service Bulletin 412-93-79 Rev A to address the issue of over-temperature indicators on the main driveshaft and tail rotor drive. The policy objective of this directive is to enhance the safety of air operations by ensuring that the specified helicopters are equipped with reliable temperature indicators, thus preventing potential overheating and subsequent mechanical failures. The directive was issued following advice from Bell Helicopter regarding the improved reliability of self-adhesive temperature indicators compared to the previously used zinc chromate primer stripe. This change was prompted by a need to maintain stringent safety standards and follows a similar directive issued by Transport Canada. Compliance with this directive is required as specified in the Requirement Document, effective from 15 September 1994, and allows the Pilot in Command to carry out and certify the required serviceability check.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate the issuance of airworthiness directives to ensure the safety and airworthiness of aircraft in Australia. This particular directive, AD/BELL 412/32, applies to all model Bell Helicopter Textron 412 Series Helicopters with specific serial numbers ranging from 33001 through 33213, 34001 through 34024, and 36001 through 36086. The directive requires compliance with Bell Helicopter Alert Service Bulletin 412-93-79 Rev A, which was issued to address the reliability of over-temperature indicators on the main driveshaft and tail rotor drive. Compliance with this directive is mandatory and must be met as per the requirements specified in the directive document, effective from 15 September 1994. Notably, the pilot in command is authorised to perform and certify the required serviceability checks in the maintenance release. This directive underscores the importance of maintaining specific operational standards to ensure the safe operation of these aircraft within Australian airspace.

Key Provisions

The Civil Aviation Regulations 1998, under PART 39 - 105, specifically address the Airworthiness Directives for Bell Helicopter Textron 412 Series Helicopters. The directive AD/BELL 412/32 mandates the replacement of the over-temperature indicators on the main driveshaft and tail rotor drive, effective for certain serial numbers of the Bell Helicopter Textron 412 Series. The requirement is to comply with Bell Helicopter Alert Service Bulletin 412-93-79 Rev A, which supersedes previous methods of over-temperature indication and aligns with the directives issued by Transport Canada on April 11, 1994. Compliance with these directives is mandatory and must be achieved as specified in the Requirement Document, which came into effect on September 15, 1994. These regulations impose specific obligations on the owners and operators of Bell Helicopter Textron 412 Series Helicopters. The most pertinent requirement is the adherence to the Bell Helicopter Alert Service Bulletin 412-93-79 Rev A, which includes replacing the over-temperature indicators with self-adhesive temperature indicators. Operators are also required to ensure that the Pilot in Command can perform and certify the necessary serviceability checks as outlined in the Requirement Document. This ensures that the maintenance and operational readiness of the aircraft meet the safety standards set forth by the Civil Aviation Safety Authority. Failure to comply with the AD/BELL 412/32 directive can result in serious consequences. While the exact penalties are not specified in the directive itself, non-compliance with Civil Aviation Regulations can generally lead to enforcement actions by the Civil Aviation Safety Authority. These actions can include fines, suspension or revocation of airworthiness certificates, and potential criminal charges. The severity of the penalties may depend on the extent and impact of the non-compliance on aviation safety. Operators must, therefore, ensure they adhere strictly to the requirements to avoid any legal repercussions.